Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole
Present works report the synthesis and characterization of a series of homologous symmetrical dimers α,ω-bis[4-(6′-methoxybenzothiazol-2′-yl)iminomethylphenoxy]alkane. Total of five members with different lengths of alkyl spacer groups of even parity varying from butyl (C4H8) to dodecyl (C12H24) wer...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Published: |
University of Kerbala
2015
|
| Subjects: |
| _version_ | 1796860908689948672 |
|---|---|
| author | Lee, Siew Ling Sastry, S. Sreehari Guan, Yeow Yeap Hong, Cheu Lin Kok, Leei Foo Sie, Tiong Ha Chien, Min Lin |
| author_facet | Lee, Siew Ling Sastry, S. Sreehari Guan, Yeow Yeap Hong, Cheu Lin Kok, Leei Foo Sie, Tiong Ha Chien, Min Lin |
| author_sort | Lee, Siew Ling |
| collection | ePrints |
| description | Present works report the synthesis and characterization of a series of homologous symmetrical dimers α,ω-bis[4-(6′-methoxybenzothiazol-2′-yl)iminomethylphenoxy]alkane. Total of five members with different lengths of alkyl spacer groups of even parity varying from butyl (C4H8) to dodecyl (C12H24) were prepared and characterized. Infrared and nuclear magnetic resonance (1H and 13C NMR) together with electron-ionization mass spectrometric techniques were employed to confirm the molecular structures of the dimers. The phase phase transition and associated enthalpy changes were obtained using differential scanning calorimetry. Textures studies and mesophase identification were conducted using a polarizing optical microscope attached to hotstage. A diversity of phase-transition behavior was observed as the length of the alkyl spacer increased from C4H8 to C12H24. Almost all title compounds exhibited nematic phase except the dimers containing butyl and hexyl spacers in which the mesomorphic properties were absent. |
| first_indexed | 2024-03-05T19:48:21Z |
| format | Article |
| id | utm.eprints-60436 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T19:48:21Z |
| publishDate | 2015 |
| publisher | University of Kerbala |
| record_format | dspace |
| spelling | utm.eprints-604362021-08-22T08:39:02Z http://eprints.utm.my/60436/ Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole Lee, Siew Ling Sastry, S. Sreehari Guan, Yeow Yeap Hong, Cheu Lin Kok, Leei Foo Sie, Tiong Ha Chien, Min Lin Q Science (General) Present works report the synthesis and characterization of a series of homologous symmetrical dimers α,ω-bis[4-(6′-methoxybenzothiazol-2′-yl)iminomethylphenoxy]alkane. Total of five members with different lengths of alkyl spacer groups of even parity varying from butyl (C4H8) to dodecyl (C12H24) were prepared and characterized. Infrared and nuclear magnetic resonance (1H and 13C NMR) together with electron-ionization mass spectrometric techniques were employed to confirm the molecular structures of the dimers. The phase phase transition and associated enthalpy changes were obtained using differential scanning calorimetry. Textures studies and mesophase identification were conducted using a polarizing optical microscope attached to hotstage. A diversity of phase-transition behavior was observed as the length of the alkyl spacer increased from C4H8 to C12H24. Almost all title compounds exhibited nematic phase except the dimers containing butyl and hexyl spacers in which the mesomorphic properties were absent. University of Kerbala 2015 Article PeerReviewed Lee, Siew Ling and Sastry, S. Sreehari and Guan, Yeow Yeap and Hong, Cheu Lin and Kok, Leei Foo and Sie, Tiong Ha and Chien, Min Lin (2015) Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole. Karbala International Journal Of Modern Science, 1 (3). pp. 152-158. ISSN 2405-609X http://dx.doi.org/10.1016/j.kijoms.2015.11.001 DOI: 10.1016/j.kijoms.2015.11.001 |
| spellingShingle | Q Science (General) Lee, Siew Ling Sastry, S. Sreehari Guan, Yeow Yeap Hong, Cheu Lin Kok, Leei Foo Sie, Tiong Ha Chien, Min Lin Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title | Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title_full | Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title_fullStr | Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title_full_unstemmed | Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title_short | Synthesis, characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| title_sort | synthesis characterization and mesomorphic properties of new symmetrical dimer liquid crystals derived from benzothiazole |
| topic | Q Science (General) |
| work_keys_str_mv | AT leesiewling synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT sastryssreehari synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT guanyeowyeap synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT hongcheulin synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT kokleeifoo synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT sietiongha synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole AT chienminlin synthesischaracterizationandmesomorphicpropertiesofnewsymmetricaldimerliquidcrystalsderivedfrombenzothiazole |